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Copy pathdbg_evaluate.cpp
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186 lines (173 loc) · 3.42 KB
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#include "dbg_evaluate.h"
#include "dbg_format.h"
#include <lua.hpp>
#include <vector>
#include <map>
namespace vscode
{
struct strbuilder
: public std::vector<std::string>
{
strbuilder()
: n(0)
{ }
void clear()
{
n = 0;
std::vector<std::string>::clear();
}
strbuilder& operator += (const std::string& s)
{
push_back(s);
n += s.size();
return *this;
}
strbuilder& operator += (std::string&& s)
{
push_back(std::forward<std::string>(s));
n += s.size();
return *this;
}
strbuilder& operator += (strbuilder&& sb)
{
for (const std::string& s : sb)
{
(*this) += std::move(s);
}
sb.clear();
return *this;
}
operator std::string()
{
std::string r;
r.reserve(n);
for (const std::string& s : *this)
{
r += std::move(s);
}
return std::move(r);
}
size_t n;
};
bool evaluate(lua_State* L, lua_Debug *ar, const char* script, int& nresult, bool writeable)
{
strbuilder code;
strbuilder local;
int startstack = lua_gettop(L);
int srcfunc = 0;
std::map<std::string, int> id_local;
std::map<std::string, int> id_upvalue;
lua_checkstack(L, 16);
for (int i = 1;; ++i)
{
const char* name = lua_getlocal(L, ar, i);
if (!name) break;
if (name[0] == '(') { lua_pop(L, 1); continue; }
code += format("local %s\n", name);
if (writeable)
local += format("[%d]=%s,", i, name);
id_local[name] = lua_gettop(L);
if (i % 10 == 0)
{
lua_checkstack(L, 10);
}
}
if (lua_getinfo(L, "f", ar))
{
srcfunc = lua_gettop(L);
for (int i = 1;; ++i)
{
const char* name = lua_getupvalue(L, -1, i);
if (!name) break;
code += format("local %s\n", name);
id_upvalue[name] = i;
lua_pop(L, 1);
}
}
code += "return ";
if (writeable)
{
code += "function() return{";
code += local;
code += "}\nend\n,";
}
code += "function(...)\n";
code += script;
code += "\nend";
std::string codestr = code;
if (luaL_loadbuffer(L, codestr.data(), codestr.size(), "=(debug)"))
{
return false;
}
// todo: pcall?
lua_call(L, 0, writeable? 2: 1);
for (int i = 1;; ++i)
{
const char* name = lua_getupvalue(L, -1, i);
if (!name) break;
lua_pop(L, 1);
if (writeable)
{
auto it = id_upvalue.find(name);
if (it != id_upvalue.end())
{
lua_upvaluejoin(L, -1, i, srcfunc, it->second);
continue;
}
}
else
{
auto it = id_upvalue.find(name);
if (it != id_upvalue.end())
{
if (lua_getupvalue(L, srcfunc, it->second))
{
if (!lua_setupvalue(L, -2, i))
lua_pop(L, 1);
}
continue;
}
}
{
auto it = id_local.find(name);
if (it != id_local.end())
{
lua_pushvalue(L, it->second);
if (!lua_setupvalue(L, -2, i))
lua_pop(L, 1);
continue;
}
}
}
int vararg = 1;
for (;; ++vararg)
{
if (!lua_getlocal(L, ar, -vararg))
break;
}
int start = lua_gettop(L) - vararg;
if (lua_pcall(L, vararg - 1, LUA_MULTRET, 0))
{
lua_rotate(L, startstack + 1, 1);
lua_settop(L, startstack + 1);
return false;
}
nresult = lua_gettop(L) - start;
if (writeable)
{
lua_rotate(L, start, 1);
lua_call(L, 0, 1);
lua_pushnil(L);
while (lua_next(L, -2))
{
if (!lua_setlocal(L, ar, (int)lua_tointeger(L, -2))) {
lua_pop(L, 1);
}
}
lua_pop(L, 1);
}
lua_rotate(L, startstack + 1, nresult);
lua_settop(L, startstack + nresult);
return true;
}
}